Semiconductor package and method for fabricating the same

ABSTRACT

A semiconductor package includes a semiconductor chip having a first bump group and a second bump group, and a package substrate having a first pattern for data communication with the semiconductor chip and a second pattern for supplying power to the semiconductor chip or grounding the semiconductor chip, wherein the first bump group is disposed on the first pattern and the second bump group is disposed on the second pattern.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No.12/788,901, filed on May 27, 2010 which claims priority under 35 U.S.C.§119 to Korean Patent Application No. 10-2009-0101683, filed on Oct. 26,2009, the disclosures of which are incorporated by reference herein intheir entireties.

TECHNICAL FIELD

The present disclosure relates to semiconductor devices, and moreparticularly, to semiconductor packages and methods for fabricating thesame.

DISCUSSION OF RELATED ART

A number of semiconductor chips having similar or different functionscan be stacked on top of each other to form a semiconductor package. Anexample of this configuration is a flip-chip package. The flip-chippackage includes a semiconductor chip disposed on a package substrate. Aplurality of bumps are disposed on the semiconductor chip and printedcircuit board (PCB) patterns are disposed on the package substrate.However, separate lands on the package substrate are required forreceiving the bumps, and the PCB patterns are formed around the lands.Forming separate lands and/or forming the PCB patterns around the landsincreases manufacturing costs.

SUMMARY

Embodiments of the inventive concept provide semiconductor packages andmethods for fabricating the same, which improves the mechanical andelectrical characteristics of the semiconductor packages.

Embodiments of the inventive concept also provide semiconductor packagesand methods for fabricating the same, which can eliminate or minimizethe area consumption and the bypass formation of a PCB caused byformation of a separate land, by using PCB patterns as a land for bumps.

Embodiments of the inventive concept also provide semiconductor packagesand methods for fabricating the same, which can improve the mechanicaland electrical characteristics by bonding a plurality of bumps to onePCB pattern.

Embodiments of the inventive concept also provide semiconductor packagesand methods for fabricating the same, which can apply the utilization ofPCB patterns as a land and the bonding of a plurality of bumps to onePCB to chip stacking and package stacking.

According to an exemplary embodiment, a semiconductor package comprisesa semiconductor chip having a first bump group and a second bump group,and a package substrate having a first pattern for data communicationwith the semiconductor chip and a second pattern for supplying power tothe semiconductor chip or grounding the semiconductor chip, wherein thefirst bump group is disposed on the first pattern and the second bumpgroup is disposed on the second pattern.

The first bump group may comprise a first real bump disposed on a firstconductive pad of the semiconductor chip and a first dummy bump disposedon a passivation layer of the semiconductor chip, and the second bumpgroup may comprise a second real bump disposed on a second conductivepad and a second dummy bump disposed on the passivation layer.

The first real bump and the second real bump can be disposed between thefirst dummy bump and the second dummy bump.

The first dummy bump and the second dummy bump can be disposed betweenthe first real bump and the second real bump.

The first bump group may comprise a first real bump disposed on a firstconductive pad of the semiconductor chip and a first dummy bump disposedon a passivation layer of the semiconductor chip, and the second bumpgroup may comprise a second real bump disposed on a second conductivepad and a third real bump disposed on a third conductive pad.

The second conductive pad and the third conductive pad can beelectrically connected to each other.

The second conductive pad and the third conductive pad can beelectrically isolated from each other.

The second bump group may further comprise a fourth real bump disposedon both a fourth conductive pad and a fifth conductive pad.

The first bump group may comprise a first real bump disposed on a firstconductive pad of the semiconductor chip and a second real bump disposedon a second conductive pad, and the second bump group may comprise athird real bump disposed on a third conductive pad and a fourth realbump disposed on a fourth conductive pad.

The second bump group may further comprise a fifth real bump disposed onboth a sixth conductive pad and a seventh conductive pad.

The third real bump and the fourth real bump can be disposed on a commonpower metal formed on a substrate of the semiconductor chip.

The third real bump and the fourth real bump can be disposed on aredistribution line disposed on a substrate of the semiconductor chip.

The first real bump and the second real bump can be electricallyconnected to each other, and the third real bump and the fourth realbump can be electrically connected to each other.

The first real bump and the second real bump can be electricallyconnected to each other, and the third real bump and the fourth realbump can be electrically isolated from each other.

A width of the second conductive pad can be larger than a width of thethird conductive pad.

The first real bump can provide an electrical signal path between thesemiconductor chip and the first pattern, and the first dummy bumpsupports the semiconductor chip on the package substrate.

The second real bump can provide a power signal path between thesemiconductor chip and the second pattern, and the second dummy bump cansupport the semiconductor chip on the package substrate.

The first dummy bump can be larger than the first real bump and thesecond dummy bump can be larger than the second real bump.

The first pattern may comprise a land receiving the first real bump andan extension extending from the land to receive the first dummy bump,the extension having a smaller width than the land.

The second pattern may comprise a land receiving the second real bumpand an extension extending from the land to receive the second dummybump, the extension being larger than the land.

The first and second patterns may comprise PCB patterns.

The first and second real bumps may comprise metal.

According to an exemplary embodiment, a semiconductor package maycomprise a package substrate having at least one circuit pattern, and asemiconductor chip having a plurality of bumps, the semiconductor chipdisposed on the package substrate, wherein at least two bumps of thesemiconductor chip are disposed on the at least one circuit pattern.

The at least two bumps may comprise a first bump disposed on a pad andconnected to an on chip circuit, and a second bump disposed on apassivation layer of the semiconductor chip.

The at least two bumps may comprise a first bump disposed on a pad andconnected to an on chip circuit, and a second bump disposed on an onchip metal and electrically connected to the first bump.

The second bump can be larger than the first bump.

According to an exemplary embodiment, a semiconductor package comprisesa package substrate having a plurality of circuit patterns, and asemiconductor chip having a plurality of bumps, the semiconductor chipdisposed on the package substrate, wherein respective extension paths ofthe plurality of bumps correspond to respective extension paths of thecircuit patterns.

The plurality of bumps can be distributed uniformly.

The plurality of bumps can be distributed non-uniformly.

A majority of the bumps can be distributed near an edge of thesemiconductor chip.

According to an exemplary embodiment, a method of forming asemiconductor package comprises forming a plurality of circuit patternson a package substrate, forming a plurality of bumps on a semiconductorchip following extension paths of the plurality of circuit patterns ofthe package substrate, and disposing the package substrate on thesemiconductor chip such that the plurality of bumps are disposed on theplurality of circuit patterns.

The plurality of bumps can be disposed uniformly from one end to theother end of each circuit pattern.

The plurality of bumps may comprise a plurality of dummy bumpselectrically insulated from the circuit patterns.

According to an exemplary embodiment, a system for transmitting orreceiving data comprises a memory device for storing a program, and aprocessor in communication with the memory device, wherein the memorydevice comprises a semiconductor package comprising, a package substratehaving a plurality of circuit patterns, and a semiconductor chip havinga plurality of bumps, the semiconductor chip disposed on the packagesubstrate, wherein respective extension paths of the plurality of bumpscorrespond to respective extension paths of the circuit patterns.

The system may comprise at least one of a mobile system, a portablecomputer, a web tablet, a mobile phone, a digital music player, or amemory card.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the inventive concept can be understood in moredetail from the following descriptions taken in conjunction with theaccompanying drawings, in which:

FIG. 1A is a sectional view of a semiconductor package according to anembodiment of the inventive concept;

FIGS. 1B and 1C are sectional views of a semiconductor chip in asemiconductor package according to an embodiment of the inventiveconcept;

FIG. 1D is a plan view illustrating PCB patterns in a semiconductorpackage according to an embodiment of the inventive concept;

FIG. 1E is a plan view illustrating electrical connections between chippads and bumps in a semiconductor package according to an embodiment ofthe inventive concept;

FIG. 1F is a plan view illustrating electrical connections between chippads and bumps in a semiconductor package according to an embodiment ofthe inventive concept;

FIG. 2A is a sectional view of a semiconductor package according to anembodiment of the inventive concept;

FIG. 2B is a sectional view of a semiconductor chip in a semiconductorpackage according to an embodiment of the inventive concept;

FIG. 2C is a plan view illustrating PCB patterns in a semiconductorpackage according to an embodiment of the inventive concept;

FIG. 2D is a plan view illustrating electrical connections between chippads and bumps in the semiconductor package of FIG. 1A;

FIG. 3A is a sectional view of a semiconductor package according to anembodiment of the inventive concept;

FIG. 3B is a sectional view of a semiconductor chip in a semiconductorpackage according to an embodiment of the inventive concept;

FIG. 3C is a plan view illustrating PCB patterns in a semiconductorpackage according to an embodiment of the inventive concept;

FIG. 3D is a sectional view illustrating an embodiment of thesemiconductor chip of FIG. 3B;

FIG. 3E is a plan view illustrating an embodiment of the PCB patterns ofFIG. 3C;

FIG. 3F is a sectional view illustrating an embodiment of thesemiconductor chip of FIG. 3B;

FIG. 3G is an expanded sectional view of a portion of FIG. 3F;

FIGS. 3H and 3I are plan views illustrating some embodiments of the PCBpatterns of FIG. 3C.

FIG. 4A is a sectional view of a semiconductor package according to anembodiment of the inventive concept;

FIG. 4B is a sectional view of a semiconductor chip in a semiconductorpackage according to an embodiment of the inventive concept;

FIG. 4C is a plan view illustrating PCB patterns in a semiconductorpackage according to an embodiment of the inventive concept;

FIG. 4D is a sectional view illustrating an example of a crack in a bumpin a semiconductor package;

FIG. 4E is a plan view illustrating an example of a crack in some bumpsof a first bump group in a semiconductor package;

FIG. 4F is a plan view illustrating an example of a crack in some bumpsof a second bump group in a semiconductor package;

FIGS. 4G, 4H, 4I, and 4J are sectional views illustrating variousstructures of a semiconductor chip in a semiconductor package accordingto embodiments of the inventive concept;

FIGS. 5A, 5B, 5C, and 5D are sectional views illustrating asemiconductor package fabrication method according to an embodiment ofthe inventive concept;

FIGS. 6A and 6B are plan views illustrating a method of a semiconductorpackage according to an embodiment of the inventive concept;

FIG. 7A is a sectional view of a semiconductor package according to anembodiment of the inventive concept;

FIG. 7B is a plan view illustrating a portion of a semiconductor packageaccording to an embodiment of the inventive concept;

FIG. 8A is a sectional view of a semiconductor package according to anembodiment of the inventive concept;

FIG. 8B is a plan view illustrating a portion of a semiconductor packageaccording to an embodiment of the inventive concept;

FIG. 9A is a sectional view of a semiconductor package according to anembodiment of the inventive concept;

FIG. 9B is a perspective view of a semiconductor package according to anembodiment of the inventive concept;

FIG. 9C is a sectional view illustrating an embodiment of thesemiconductor package of FIG. 9A;

FIG. 9D is a perspective view illustrating an embodiment of thesemiconductor package of FIG. 9A;

FIG. 10A is a block diagram of a memory card having a semiconductorpackage according to an embodiment of the inventive concept; and

FIG. 10B is a block diagram of an information processing system using asemiconductor package according to an embodiment of the inventiveconcept.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Exemplary embodiments of the inventive concept will be described belowin more detail with reference to the accompanying drawings. Theinventive concept may, however, be embodied in different forms andshould not be construed as limited to the embodiments set forth herein.

FIG. 1A is a sectional view of a semiconductor package according to anembodiment of the inventive concept, which is taken along the line I-I′of FIG. 1D. FIGS. 1B and 1C are sectional views of a semiconductor chipin the semiconductor package of FIG. 1A. FIG. 1D is a plan viewillustrating a PCB patterns in the semiconductor package of FIG. 1A.FIG. 1E is a plan view illustrating electrical connections between chippads and bumps in the semiconductor package of FIG. 1A. FIG. 1F is aplan view illustrating PCB patterns in the semiconductor packageaccording to an embodiment of the inventive concept.

Referring to FIG. 1A, a semiconductor package 100 according to anembodiment of the inventive concept may include a package substrate 110and a semiconductor chip 150 mounted on the package substrate 110. Thesemiconductor package 100 may be molded by a molding layer 180. Anunderfill layer 170 may be provided between the semiconductor chip 150and the package substrate 110. The semiconductor package 100 may be aflip-chip package where the semiconductor chip 150 is facedown-mountedon the package substrate 110.

For example, the package substrate 110 may include a printed circuitboard (PCB) that has copper-clad circuit patterns formed on one or bothsides of a core 112 formed of fiber-reinforced glass or epoxy resin. Thecircuit patterns may include a pattern for providing an electricalsignal path for data communication with the semiconductor chip 150, apattern for delivering power to the semiconductor chip 150 or groundingthe semiconductor chip 150, and a pattern connected to an externalterminal. According to an exemplary embodiment, the package substrate110 may include at least one first pattern 122 for providing anelectrical signal path for data communication with the semiconductorchip 150, and at least one second pattern 124 for supplying power to thesemiconductor chip 150 or grounding the semiconductor chip 150. Forexample, at least one of the first and second patterns 122 and 124 maybe formed in the shape of line and/or plate having at least one verticalvia, wherein the via is substantially perpendicular to a surface of thefirst or second pattern 122, 124. The first pattern 122 may include atleast one of a signal pattern, a power pattern and a ground pattern.Similarly, the second pattern 124 may include at least one of a signalpattern, a power pattern and a ground pattern. The first and secondpatterns 122 and 124 may be different from each other. As one example,the first pattern 122 may be the signal pattern, and the second pattern124 may be one of the power and ground patterns.

The package substrate 110 may include a substrate pad 118 connected toan external terminal 105 (e.g., a solder ball or lead-frame) thatelectrically connects the semiconductor package 100 to an externalelectrical device. Alternatively, the substrate pad 118 may be used asthe external terminal. The substrate pad 118 may comprise, for example,copper or aluminum. For example, an upper dielectric layer 114 and alower dielectric layer 116, formed of photoresist, may be disposedrespectively on the top and bottom surfaces of the core 112. The signalpattern 122 and the power pattern 124 may be exposed through the upperdielectric layer 114, and the substrate pad 118 may be exposed throughthe lower dielectric layer 116.

Referring to FIGS. 1A and 1B, the semiconductor chip 150 may be a memoryor non-memory chip that has bumps 130 and 140 formed on a semiconductorsubstrate 157. The semiconductor substrate 157 may be, for example, asilicon wafer or a silicon-on-insulator (SOI) wafer. The semiconductorchip 150 may have a center pad structure. For example, the semiconductorchip 150 may include center chip pads 161 and 163 disposed at a center150 y thereof, a passivation layer 158 protecting the semiconductorsubstrate 157, and a dielectric layer 159 defining a land for the bumps130 and 140. The center chip pads 161 and 163 may be formed of metalsuch as, for example, copper or aluminum. The passivation layer 158 maybe formed of resin such as, for example, photosensitive polyimide(PSPI). The dielectric layer 159 may be formed of dielectric such as,for example, silicon oxide or silicon nitride. The semiconductor chip150 may be flip-mounted on the package substrate 110, and the bumps 130and 140 may be connected to the PCB patterns 122 and 124 of the packagesubstrate 110. The bumps 130 and 140 may include a first bump group 130connected electrically to the signal pattern 122, and a second bumpgroup 140 connected electrically to the power pattern 124.

The first bump group 130 may include at least one bump 131 connected tothe center chip pad 161, and a plurality of bumps 132, 133 and 134 thatare not connected to the center chip pad 161. The bump 131 may be a realbump for providing an electrical signal path between the semiconductorchip 150 and the signal pattern 122, and the bumps 132 to 134 may bedummy bumps for supporting the semiconductor chip 150 on the packagesubstrate 110. The real bump 131 may be disposed at the center 150 y ofthe semiconductor chip 150, and the dummy bumps 132 to 134 may bedisposed at an edge region of the semiconductor chip 150. For example,the dummy bumps 132 to 134 may be disposed at one side edge (e.g., aleft edge 150 x) of the semiconductor chip 150.

The second bump group 140 may include at least one bump 141 connected tothe center chip pad 163, and a plurality of bumps 142, 143 and 144 thatare not connected to the center chip pad 163. The bump 141 may be a realbump for providing a power signal between the semiconductor chip 150 andthe power pattern 124, and the bumps 142 to 144 may be dummy bumps forsupporting the semiconductor chip 150 on the package substrate 110. Thereal bump 141 may be disposed at the center 150 y of the semiconductorchip 150, and the dummy bumps 142 to 144 may be disposed at an edgeregion of the semiconductor chip 150. For example, the dummy bumps 142to 144 may be disposed at one side edge (e.g., a right edge 150 z) ofthe semiconductor chip 150. In an exemplary embodiment, the second bumpgroup 140 may further include dummy bumps 145 and 146 as illustrated inFIG. 1D. The bump 131 may include a pillar 131 a formed of metal suchas, for example, copper. Solder 131 b may be disposed on the pillar 131a. The solder 131 b may increase the bonding force between the pillar131 a and the first pattern 122.

Referring to FIG. 1C, the semiconductor chip 150 does not include thedielectric layer 159 (see FIG. 1B), and the passivation layer 158protects the semiconductor substrate 157 and defines the bump land. Inan exemplary embodiment, in the first bump group 130, the real bump 131may be different in size from the dummy bumps 132 to 134. For example,to support the semiconductor chip 150, the dummy bumps 132 to 134 may belarger than the real bump 131. In an exemplary embodiment, in the secondbump group 140, the dummy bumps 142 to 146 may be larger than the realbump 141.

Referring to FIGS. 1A and 1D, the package substrate 110 may include PCBpatterns in which at least one signal pattern 122 and at least one powerpattern 124 may be provided. The first bump group 130 may be connectedto the signal pattern 122, and the second bump group 140 may beconnected to the power pattern 124. According to an embodiment of theinventive concept, all the bumps 131 to 134 of the first bump group 130may be disposed on the signal pattern 122, and all the bumps 141 to 146of the second bump group 140 may be disposed on the power pattern 124.In the drawings including FIG. 1D, a hatched circle represents a realbump, and a hollow circle represents a dummy bump.

The signal pattern 122 may include a land 122 b connected to the realbump 131, and an extension portion 122 e extending from the land 122 b.The extension portion 122 e may be smaller in width than the land 122 b.For example, the land 122 b may be disposed at the center 150 y of thesemiconductor chip 150, and the extension portion 122 e may extend fromthe center 150 y to the left edge 150 x or the right edge 150 z.Similarly, the power pattern 124 may include a land 124 b connected tothe real bump 141, and an extension portion 124 e extending from theland 124 b. For effective power delivery, the extension portion 124 emay be much larger than the land 124 b. For example, the land 124 b maybe disposed at the center 150 y of the semiconductor chip 150, and theextension portion 124 e may extend from the center 150 y to the rightedge 150 z or the left edge 150 x. The signal pattern 122 is not limitedto a straight line shape and may have various shapes such as, forexample, a bending shape. Similarly, the power pattern 124 is notlimited to a line shape and may have various shapes.

In the signal pattern 122 on the line I-I′, the real bump 131 of thefirst bump group 130, which is disposed at the center 150 y of thesemiconductor chip 150, may be connected to the land 122 b of the signalpattern 122 to transmit electrical signals from the semiconductor chip150 to the signal pattern 122 or from the signal pattern 122 to thesemiconductor chip 150. The dummy bumps 132 to 134 of the first bumpgroup 130, which are located at the left edge 150 x of the semiconductorchip 150, may be connected to the extension portion 122 e of the signalpattern 122 to support the semiconductor chip 150 on the packagesubstrate 110. Because the extension portion 122 e of the signal pattern122 is used as a land for the dummy bumps 132 to 134, it is unnecessaryto form dummy bump lands in the package substrate 110. Thus, the area ofthe package substrate 110 can be maximized. According to an embodiment,the signal pattern 122 can be formed without changing extensiondirections around the dummy bumps, and an input/output (I/O) skew causedby the changing of the extension directions can be prevented. The numberor density of the dummy bumps 132 to 134 is not limited to thisembodiment. The dummy bumps 132 to 134 may be distributed at the leftedge 150 x or the right edge 150 z with a uniform density or anon-uniform density. The dummy bumps 132 to 134 may be intensivelyarranged at a portion of the semiconductor chip 150 to which arelatively heavy stress is applied. For example, a larger number ofdummy bumps 132 to 134 may be arranged at the outermost portion of theleft edge 150 x or the right edge 150 z than at the other portions.

Similarly, in the power pattern 124 on the line I-I′, the real bump 141of the second bump group 140, which is disposed at the center 150 y ofthe semiconductor chip 150, may be connected to the land 124 b of thepower pattern 124 to transmit electrical signals from the power pattern124 to the semiconductor chip 150. The dummy bumps 142 to 146 of thesecond bump group 140, which are located at the right edge 150 z of thesemiconductor chip 150, may be connected to the extension portion 124 eof the power pattern 124 to support the semiconductor chip 150 on thepackage substrate 110. Because the extension portion 124 e of the powerpattern 124 is used as a land for the dummy bumps 142 to 146, there isno consumption of the area of the package substrate 110 by the dummybump land and it is unnecessary to form the power pattern 124 in abypass manner or in a reduced manner. Accordingly, power can be smoothlyand stably supplied to the semiconductor chip 150. The number or densityof the dummy bumps 142 to 146 is not limited to this embodiment. Thedummy bumps 142 to 146 may be distributed at the left edge 150 x or theright edge 150 z with a uniform density or a non-uniform density. Thedummy bumps 142 to 146 may be intensively arranged at a portion of thechip 150 to which a relatively heavy stress is applied. For example, alarger number of dummy bumps 142 to 146 may be arranged at the outermostportion of the left edge 150 x or the right edge 150 z than at the otherportions.

Referring to FIG. 1E, the first bump group 130 may be in one-to-onecorrespondence with the center chip pad 161, and the second bump group140 may be in one-to-one or one-to-many correspondence with the centerchip pad 163. For example, one first bump group 130 connected to onesignal pattern 122 may be electrically connected to one center chip pad161. One second bump group 140 connected to one power pattern 124 may beelectrically connected to one or more center chip pads 163. The centerchip pad 161 and the real bump 131 can be vertically aligned. However,in FIG. 1E, for the convenience of illustration, the center chip pad 161and the real bump 131 are illustrated as being horizontally aligned.Also, in FIG. 1E, for the convenience of illustration, the center chippad 163 and the real bump 141 are illustrated as being horizontallyaligned.

When external stress or heat is applied to the semiconductor package100, mechanical and/or thermal stress may be more concentrated to theedges 150 x and 150 z than to the center 150 y of the semiconductor chip150, which may cause exfoliations or cracks in the semiconductor package100. According to an embodiment of the inventive concept, the mechanicaldurability of the semiconductor package 100 can be improved because theedges 150 x and 150 z of the semiconductor chip 150 are supported by thedummy bumps 132 to 134 and 142 to 146.

According to an embodiment of the inventive concept, the semiconductorchip 150 can have a center pad structure. Accordingly, power can besymmetrically delivered from the center 150 y to the left and rightedges 150 x and 150 z. Therefore, stable power supply can beimplemented, I/O skew can be eliminated, and cell distribution can bemanaged efficiently. Also, according to an embodiment of the inventiveconcept, the semiconductor package 100 can have a flip-chip bondingstructure. Therefore, the semiconductor package 100 can implement moreinputs/outputs than a wire-bonding structure and a lead-bondingstructure, and can reduce the length of an electrical signal path. Dueto the above characteristics, the semiconductor package 100 according toan embodiment of the inventive concept can be usefully utilized ingraphic devices and electronic data processing (EDP) devices.

Referring to FIG. 1F, the semiconductor chip 150 may have a matrix padstructure. In this embodiment, the signal pattern 122 and the powerpattern 124 may be arranged uniformly or non-uniformly at the packagesubstrate 110. In this case, because the first bump group 130 may bearranged uniformly or non-uniformly at the overall area of thesemiconductor chip 150, real bumps 131 may be distributed not only atthe center 150 y of the semiconductor chip 150 but also at the left edge150 x and/or the right edge 150 z thereof. Similarly, the dummy bumps132 to 134 may be distributed not only at the center 150 y of thesemiconductor chip 150 but also at the left edge 150 x and/or the rightedge 150 z thereof. The arrangement of the second bump group 140 may beidentical to that of the first bump group 130.

FIGS. 2A to 2D illustrate an embodiment according to the inventiveconcept. FIG. 2A is a sectional view taken along the line II-II′ of FIG.2C.

Referring to FIGS. 2A and 2B, a semiconductor package 102 according toan embodiment may be a flip-chip package where a semiconductor chip 152with an edge pad structure is facedown-mounted on a package substrate110. For example, chip pads 161 and 163 may be disposed at edges 152 xand 152 z of the semiconductor chip 152, and real bumps 131 and 141 maybe connected to the edge chip pads 161 and 163.

Referring to FIGS. 2A and 2C, in the signal pattern 122 on the lineII-II′, the land 122 b of the signal pattern 122 may be disposed at theleft edge 152 x of the semiconductor chip 152, and an extension portion122 e may extend from the left edge 152 x to a center 152 y. In a powerpattern 124 on the line II-II′, a land 124 b of the power pattern 124may be disposed at a right edge 152 z, and an extension portion 124 emay extend from the right edge 152 z to the center 152 y. Thus, a realbump 131 of a first bump group 130 may be disposed at the left edge 152x of the semiconductor chip 152, and dummy bumps 132 to 134 may bedisposed at the center 152 y and the left edge 152 x. The number ordensity of the dummy bumps 132 to 134 may be uniform irrespective of theleft edge 152 x and the center 152 y. Alternatively, the number ordensity of the dummy bumps 132 to 134 may vary with the left edge 152 xand the center 152 y. For example, the number or density of the dummybumps 132 to 134 at the center 152 y may be larger or smaller than thatof the dummy bumps 132 to 134 at the left edge 152 x. A real bump 141 ofa second bump group 140 may be disposed at the right edge 152 z of thesemiconductor chip 152, and dummy bumps 142 to 146 may be disposed atthe center 152 y and the right edge 152 z of the semiconductor chip 152.The number or density of the dummy bumps 142 to 146 may be uniformirrespective of the right edge 152 z and the center 152 y.Alternatively, the number or density of the dummy bumps 142 to 146 mayvary with the right edge 152 z and the center 152 y. For example, thenumber or density of the dummy bumps 142 to 146 at the center 152 y maybe larger or smaller than that of the dummy bumps 142 to 146 at theright edge 152 z.

Referring to FIG. 2D, one first bump group 130 may be electricallyconnected to one edge chip pad 161, and one second bump group 140 may beelectrically connected to one or more edge chip pads 163.

FIG. 3A is a sectional view of a semiconductor package according to anembodiment of the inventive concept, which is taken along the lineIII-III′ of FIG. 3C. FIG. 3B is a sectional view of a semiconductor chipin a semiconductor package according to an embodiment of the inventiveconcept. FIG. 3C is a plan view illustrating a PCB in a semiconductorpackage according to an embodiment of the inventive concept.

Referring to FIGS. 3A to 3C, a semiconductor package 103 according to anembodiment of the inventive concept may be a flip-chip package where asemiconductor chip 153 is facedown-mounted on a package substrate 110.The semiconductor package 153 may include the passivation layer 158, thedielectric layer 159, the first bump group 130, and the second bumpgroup 140. The passivation layer 158 and the dielectric layer 159 aredisposed on a semiconductor substrate 157. The first bump group 130 andthe second bump group 140 electrically and physically connect thesemiconductor chip 153 to the package substrate 110. According to anembodiment, the first bump group 130 may connect the signal pattern 122to the semiconductor chip 153 electrically and physically, and thesecond bump group 140 may connect the power pattern 124 to thesemiconductor chip 153 electrically and physically.

The first bump group 130 may include the real bump 131 and dummy bumps132 to 134. The real bump 131 is connected to the center chip pad 161 toprovide an electrical signal path between the semiconductor chip 153 andthe signal pattern 122. The dummy bumps 132 to 134 are not connected tothe center chip pad 161 and support the semiconductor chip 153 on thepackage substrate 110. The first bump group 130 may be in one-to-onecorrespondence with the center chip pad 161. Thus, as illustrated inFIG. 1E, one first bump group 130 may be electrically to one center chippad 161. The real bump 131 may be disposed at a center 153 y of thesemiconductor chip 153, and the dummy bumps 132 to 134 may be disposedat edges 153 x and 153 z of the semiconductor chip 153. For example, thereal bump 131 of the first bump group 130, which is disposed on thesignal pattern 122 on the line III-III′ of FIG. 3C, may be disposed atthe center 153 y of the semiconductor chip 153. The dummy bumps 132 to134 may be disposed at the left edge 153 x of the semiconductor chip153. The dummy bumps 132 to 134 may be used as supporting bumpssupporting the left edge 153 x of the semiconductor chip 153.

The second bump group 140 may include a real bump 141 electricallyconnected to the center chip 163 for providing a power delivery pathbetween the semiconductor chip 153 and the power pattern 124 and realbumps 142 to 146 electrically connected to edge chip pads 163 a whichare electrically connected to the center chip pad 163. All the realbumps 141 to 146 of the second bump group 140 may be electricallyconnected to each other. In FIG. 3B, a solid line 169 indicates that thechip pads 163 and 163 a are electrically connected to each other. Thesecond bump group 140 may be in one-to-one or one-to-many correspondencewith the center chip pad 163. As illustrated in FIG. 1E, one second bumpgroup 140 may be electrically connected to one or more center chip pads163. Among the real bumps 141 to 146, the real bump 141 may be disposedat the center 153 y of the semiconductor chip 153, and the other realbumps 142 to 146 may be disposed at the edges 153 x and 153 z of thesemiconductor chip 153. For example, the real bump 141 of the secondbump group 140, which is disposed on the power pattern 124 on the lineIII-III′ of FIG. 3C, may be disposed at the center 153 y of thesemiconductor chip 153. The other real bumps 142 to 146 may be disposedat the right edge 153 z of the semiconductor chip 153. For example, thereal bumps 142 to 146 on an extension portion 124 e of the power pattern124 may be used as supporting bumps for supporting the right edge 153 zof the semiconductor chip 153. In an embodiment, the semiconductor chip153 may have an edge pad structure where the chip pads 161 and 163 aredisposed at the edges 153 x and 153 z.

FIG. 3D is a sectional view illustrating an embodiment of the inventiveconcept. FIG. 3E is a plan view illustrating an embodiment of the PCBpatterns of FIG. 3C.

Referring to FIGS. 3D and 3E, the semiconductor chip 153 may not includethe dielectric layer 159, and the bumps 131 to 143 may be disposed onthe passivation layer 158. In the first bump group 130, the real bump131 may be different in size from the dummy bumps 132 to 134. Forexample, to improve a supporting bump function, the dummy bumps 132 to134 may be larger than the real bump 131. In the second bump group 140,the real bumps 142 and 143 disposed at the edges 153 x and 153 z may belarger than the real bump 141 disposed at the center 153 y of thesemiconductor chip 153. For example, the real bump 143 on the extensionportion 124 e of the power pattern 124 may be formed as a mega-bumpconnectable to two or more edge chip pads 163 a. The large real bumps142 and 143 can be used as stable supporting bumps of the semiconductorchip 153 and can have effective power delivery functions.

FIG. 3F is a sectional view illustrating an embodiment of the inventiveconcept. FIG. 3G is an expanded sectional view of a portion of FIG. 3F.

Referring to FIGS. 3F and 3C, the center chip pad 163 connected to thereal bump 141 of the second bump group 140 may be a main pad to mainlysupply power to the semiconductor chip 153, and the edge chips 163 aconnected to the other real bumps 142 to 146 may be auxiliary pads tosupply an auxiliary power to the semiconductor chip 153. The edge chippads 163 a may be electrically connected to each other. For example, ifthe second pattern 124 is a power pattern, a sufficient power for ahigh-speed operation of the semiconductor chip 153 may not be suppliedfrom the power pattern 124 due to a defect in the center chip pad 163.In this case, the auxiliary power may be further supplied from the edgechip pad 163 a to the semiconductor chip 153. If the second pattern 124is a ground pattern, the ground of the semiconductor chip 153 may becomeunstable due to a defect in the center chip pad 163. In this case, theedge chip pads 163 a may be used to stably ground the semiconductor chip153. In this manner, the edge chip pads 163 a are used to reduce a powernoise, thereby providing a high-speed operation of the semiconductorchip 153.

Referring to FIGS. 3G and 3C, the center chip pad 163 may be connectedto the real bump 141 by a first width W1. The edge chip pad 163 a may beconnected to each of the real bumps 142 to 146 by a second width W2.Because the edge chip pad 163 a is used in auxiliary manner, the area ofthe edge chip pad 163 a exposed through the second width W2 need not belarger than the area of the center chip pad 163 exposed through thefirst width W1. According to some embodiments of the inventive concept,the second width W2 may be smaller than or equal to the first width W1.A pad formed at a semiconductor chip can be divided into a main pad andan auxiliary pad. A main bump and an auxiliary bump are bonded to themain pad and the auxiliary pad, respectively. The main bump and theauxiliary bump are electrically connected to a power pattern or a groundpattern. Thus, power may be stably supplied and grounded to thesemiconductor chip through not only the main pad but also the auxiliarypad. According to some embodiments of the inventive concept, it may notbe necessary to additionally form a power pattern/ground patternelectrically connected to the main bump and the auxiliary bump or tochange a pre-formed power pattern/ground pattern. The main bump 141 andauxiliary bumps 142 to 144 may be connected to a power pattern 124without changing the design of the power pattern 124. Moreover, theauxiliary bumps 142 to 146 may serve to ensure stable power supply andserve as support bumps. According to an embodiment, it is not necessaryto change the design of the ground pattern 124. Furthermore, theauxiliary bumps 142 to 146 connected to the ground pattern 124 may serveto ensure stable ground and serve as supporting bumps.

In an embodiment, the center chip pad 163 connected to the real bump 141and the edge chip pad 163 a connected to the real bump 142 may beelectrically connected to each other to provide the main pads. Also, theedge chip pads 163 a connected to the other real bumps 143 to 146 may beelectrically connected to each other to provide the auxiliary pads.

FIGS. 3H and 3I are plan views illustrating some embodiments of the PCBpatterns of FIG. 3C.

Referring to FIG. 3H, the semiconductor chip 153 may have a center padstructure. In this case, the power pattern 124 may be arranged to beconcentrated along a line at a center 110 y of the package substrate110, with the signal pattern 122 distributed at left and right edges 110x and 110 z thereof. For example, the land 122 b may be disposed at thecenter 110 y of the package substrate 110, and the extension portion 122e may extend from the center 110 y to the left edge 110 x or to theright edge 110 z thereof. This exemplary embodiment may be useful if atleast one of the signal pattern 122 and the power pattern 124 isconcentrated at some portion of the package substrate 110.

Referring to FIG. 3I, the semiconductor chip 153 may have an edge padstructure. In this case, the power pattern 124 may be arranged to beconcentrated along lines at the left and right edges 110 x and 110 z ofthe package substrate 110, with the signal pattern 122 distributed atthe center 110 y thereof. For example, the extension portion 122 e mayextend from the left edge 110 x or from the right edge 110 z to thecenter 110 y of the package substrate 110, and the land 122 b may bedisposed at the left edge 110 x or the right edge 110 z thereof.According to this exemplary embodiment, the second bump group 140 maysupply power to the semiconductor chip 153 and also support the edges ofthe semiconductor chip 153 on the package substrate 110.

FIG. 4A is a sectional view of a semiconductor package according to anembodiment of the inventive concept, which is taken along the lineIV-IV′ of FIG. 4C. FIG. 4B is a sectional view of a semiconductor chipin a semiconductor package according to an embodiment of the inventiveconcept. FIG. 4C is a plan view illustrating a PCB in a semiconductorpackage according to an embodiment of the inventive concept.

Referring to FIGS. 4A to 4C, a semiconductor package 104 according to anembodiment of the inventive concept may be a flip-chip package where asemiconductor chip 154 is facedown-mounted on a package substrate 110.The semiconductor package 154 may include the passivation layer 158, thedielectric layer 159, the first bump group 130, and the second bumpgroup 140. The passivation layer 158 and the dielectric layer 159 aredisposed on a semiconductor substrate 157. The first bump group 130 andthe second bump group 140 electrically connect the semiconductor chip154 to the package substrate 110. According to an embodiment, the firstbump group 130 may electrically connect the signal pattern 122 to thesemiconductor chip 154, and the second bump group 140 may electricallyconnect the power pattern 124 to the semiconductor chip 154.

The first bump group 130 may include a bump 131 electrically connectedto a center chip pad 161 and bumps 132 to 134 electrically connected toedge chip pads 161 a. The edge chip pads 161 a may be electricallyconnected to the center chip pad 161. All the bumps 131 to 134 of thefirst bump group 130 may be real bumps providing electrical signal pathsbetween the semiconductor chip 154 and the signal pattern 122. All thereal bumps 131 to 134 may be connected to the extension portion 122 eand the land 122 b of the signal pattern 122. For example, the real bump131 of the first bump group 130, which is disposed on the signal pattern122 on the line IV-IV′ of FIG. 4C, may be connected to the land 122 bdisposed at a center 154 y of the semiconductor chip 154. The other realbumps 132 to 134 may be connected to the extension portion 122 edisposed at a left edge 154 x of the semiconductor chip 154.

The second bump group 140 may include a bump 141 electrically connectedto a center chip pad 163 and bumps 142 to 146 electrically connected toedge chip pads 163 a. The edge chip pads 163 a may be connectedelectrically to the center chip pad 163. All the bumps 141 to 146 of thesecond bump group 140 may be real bumps to provide power delivery pathsbetween the semiconductor chip 154 and a power pattern 124. All the realbumps 141 to 146 may be connected to the extension portion 124 e and theland 124 b of the power pattern 124. For example, the real bump 141 ofthe second bump group 140, which is disposed on the power pattern 124along the line IV-IV′ of FIG. 4C, may be disposed at the land 124 bdisposed at the center 154 y of the semiconductor chip 154. The otherreal bumps 142 to 146 may be connected to the extension portion 124 edisposed at the right edge 154 z of the semiconductor chip 154. Aplurality of real bumps 141 to 146 are connected to one power pattern124, thus an effective power delivery can be achieved.

The chip pads 161 and 163 a may be formed in a matrix configuration atthe center 154 y and the edges 154 x and 154 z of the semiconductor chip154. Likewise, the first bump group 130 and the second bump group 140may be disposed in a matrix configuration throughout the semiconductorchip 154. Therefore, the semiconductor chip 154 can be stably connectedon the package substrate 110, thus having a structure strong to amechanical stress. Even when some of the bumps 131 to 134 connected tothe signal pattern 122 cannot be used as an electrical signal path,because the other bumps can be provided as an electrical signal path,the electrical characteristics can be improved. The same is true of thepower pattern 124.

The first bump group 130 may be in one-to-one correspondence with thecenter chip pad 161. Thus, one first bump group 130 may be electricallyconnected to one center chip pad 161. The second bump group 140 may bein one-to-one or one-to-many correspondence with the center chip pad163. Thus, one second bump group 140 may be electrically connected toone or more center chip pads 163.

FIG. 4D is a sectional view illustrating an example of a crack in a bumpin the semiconductor package of FIG. 4A. FIG. 4E is a plan viewillustrating an example of a crack in a bump of the first bump group.FIG. 4F is a plan view illustrating an example of a crack in a bump ofthe second bump group.

Referring to FIGS. 4D and 4E, when a mechanical and/or thermal stress isapplied to the semiconductor package 104, cracks may occur in a bump ofthe first bump group 130. For example, if a crack 139 occurs in the realbump 134 connected to the extension portion 122 e of the signal pattern122, an electrical signal may not be transmitted through the real bump134. However, the electrical signal can be transmitted through the otherreal bumps 131 to 133, thereby preventing the poor transmission of theelectrical signal.

Referring to FIGS. 4D and 4F, a crack 149 may occur in the real bump 141connected to the land 124 b of the power pattern 124, thus preventingthe power delivery or increasing the resistance. In this case, the powercan be delivered through the other real bumps 142 to 146, thus enablinga smooth power supply.

FIGS. 4G to 4J are sectional views illustrating various structures of asemiconductor chip in a semiconductor package according to embodimentsof the inventive concept.

Referring to FIGS. 4C and 4G, the dielectric layer 159 may not bedisposed on the passivation layer 158 of the semiconductor chip 154. Inthis case, the passivation layer 158 may define lands for the bumps 131to 146. The real bump 143 of the second bump group 140, which isconnected to the extension portion 124 e of the power pattern 124, maybe larger than other real bumps 141 and 142. For example, the real bump143 may be a mega-bump connectable to two or more edge chip pads 163 a.This mega-bump 143 can increase the connection area between the powerpattern 124 and the semiconductor chip 154, thereby implementingeffective power delivery and improve the supporting capability for thesemiconductor chip 154.

Referring to FIGS. 4C and 4H, some real bumps of the second bump group140, for example, the real bumps 142 to 146 connected to the extensionportion 124 e of the power pattern 124 may be connected in common to apower metal 165 in the semiconductor chip 154. In this case, theelectrical reliability and the power delivery characteristics can beimproved.

Referring to FIGS. 4C and 4I, the second bump group 140 may be disposedon a redistribution line 156. For example, all the real bumps 141 to 146of the second bump group 140 may be disposed on one redistribution line156 such that they are electrically connected to each other. The centerchip pad 163 and the power metal 165 may not be electrically connectedin a direct manner. The structure of the redistribution line 156 mayalso be applicable to the first bump group 130.

Referring to FIGS. 4C and 4J, as described with reference to FIGS. 3Fand 3G, the center chip pad 163 connected to the real bump 141 of thesecond bump group 140 may be a main pad for supplying a main power (orfor a main ground), and the edge chip pad 163 a connected to the otherreal bumps 142 to 146 may be an auxiliary pad for supplying an auxiliarypower (or for an auxiliary ground). The chip pads 161 and 161 aconnected to the first bump group 130 may all be main pads.

FIGS. 5A to 5D are sectional views illustrating a semiconductor packagefabrication method according to an embodiment of the inventive concept.FIGS. 6A to 6B are plan views illustrating a semiconductor packagefabrication method according to an embodiment of the inventive concept.

Referring to FIG. 5A, a semiconductor chip 150 to be mounted on apackage substrate 110 may be provided. The package substrate 110 may bea PCB in which an upper dielectric layer 114 and a lower dielectriclayer 116 are formed respectively on upper and lower surfaces of a core112. The core 112 may be formed of fiber-reinforced glass or epoxyresin. The upper dielectric layer 114 and the lower dielectric layer 116may be formed of photo solder resist (PSR). A PCB pattern including acopper-clad signal pattern 122 and a power pattern 124 may be formed ona top surface of the package substrate 110, and a substrate pad 118formed of metal such as, for example, copper and aluminum may be formedon a bottom surface of the package substrate 110.

The semiconductor chip 150 may include a first bump group 130 and asecond bump group 140 formed on a top surface 150 f of the semiconductorchip 150. The first bump group 130 may be connected to the signalpattern 122, and the second bump group 140 may be connected to the powerpattern 124. The number and locations of the bump of the first bumpgroup 130 may depend on the routing of the power pattern 124. Each ofthe first bump group 130 and the second bump group 140 may include aplurality of bumps, and all of the bumps may be real bumps in anembodiment. In an embodiment, at least one of the bumps may be real bumpand the other may be a dummy bump. The semiconductor chip 150 may have acenter pad structure of FIG. 1B, an edge pad structure of FIG. 2B, or amatrix pad structure of FIG. 4B. For example, providing thesemiconductor chip 150 may include forming the passivation layer 158 andthe dielectric layer 159, which open center chip pads 161 and 163, on asemiconductor substrate 157 having the center chip pads 161 and 163formed on its center 150 y as illustrated in FIG. 1B. Then, a first bumpgroup 130 and a second bump group 140 are formed on the dielectric layer159 by, for example, plating or deposition of copper and/or solder. Realbumps 131 and 141 may be connected to the center chip pads 161 and 163.

Referring to FIG. 5B, the upper dielectric layer 114 may be patterned toform a plurality of openings 115 and 117, and the semiconductor chip 150may be facedown-mounted on the package substrate 110. Thus, thesemiconductor chip 150 may be facedown-mounted in a flip state where atop surface 150 f is directed downward to the package substrate 110 anda bottom surface 150 b is directed upward. The openings 115 and 117 mayinclude a plurality of first openings 115 partially opening the signalpattern 122, and a plurality of second openings 117 partially openingthe power pattern 124. First lands 111 connected to the first bump group130 may be defined by the first openings 115, and second lands 113connected to the second bump group 140 may be defined by the secondopenings 117. The openings 115 and 117 may be formed in the shape ofholes 115 h and 117 h as illustrated in FIG. 6A, or may be formed in theshape of blocks 115 b and 117 b as illustrated in FIG. 6B.

Referring to FIG. 6A, the holes 115 h and 117 h may include a pluralityof first holes 115 h opening the signal pattern 122 to define the firstlands 111, and a plurality of second holes 117 h opening the powerpattern 124 to define the second lands 113. The first holes 115 h andthe second holes 117 h may have similar sizes or the same size. A topsurface 112 f of the core 112 may be exposed according to the size ofthe holes 115 h and 117 h.

Referring to FIG. 6B, the blocks 115 b and 117 b may include a firstblock 115 b extending in one direction, and a second block 117 b having,for example, a substantially square shape. The first block 115 b mayhave a line shape extending in the direction (e.g., the verticaldirection) substantially perpendicular to the extending direction (e.g.,the horizontal direction) of the signal pattern 122. Accordingly, aplurality of first lands 111 or a plurality of first and second lands111 and 113 may be simultaneously defined by one first block 115 b. Thesecond block 117 b may define a third land 113 b opening the extensionportion 124 e of the power pattern 124. The third land 113 b may belarger in area than the first and second lands 111 and 113. The thirdland 113 b may be useful to connect the mega-bump 143 illustrated inFIG. 3E. The top surface 112 f of the core 112 may be exposed in formingthe blocks 115 b and 117 b.

Referring to FIG. 5C, the semiconductor chip 150 may be facedown-mountedon the package substrate 110. Accordingly, the first bump group 130 maybe inserted into the first opening 115 to be connected to the signalpattern 122, and the second bump group 140 may be inserted into thesecond opening 117 to be connected to the power pattern 124. Thereafter,a molding layer 180 may be formed on the package substrate 110 to moldthe semiconductor chip 150. The molding layer 180 may comprise, forexample, epoxy molding compound (EMC). Before forming the molding layer180, an underfill layer 170 may be formed between the semiconductorsubstrate 150 and the package substrate 110. The underfill layer 170 maycomprise dielectric resin (e.g., epoxy resin) by using, for example, acapillary flow. Referring to FIG. 5C, 6A or 6B, the top surface 112 f ofthe core exposed in forming the openings 115 and 117 may be covered withthe underfill layer 170 and/or the molding layer 180.

Referring to FIG. 5D, the lower dielectric layer 116 may be patterned toform a third opening 119 opening the substrate pad 118, and an externalterminal 105 such as a solder ball may be bonded through the thirdopening 119. Forming the third opening 119 may be performedsimultaneously with forming the first and second openings 115 and 117according to an embodiment. The bonding of the external terminal 105 maybe performed in the step of providing the package substrate 110 of FIG.5A. Various semiconductor packages 102 to 104 can be implementedaccording to structures of the semiconductor chip 150 (e.g., the centerpad structure and the edge pad structure), or the types of the bumps 130and 140 (e.g., the real bump and the dummy bump).

FIG. 7A is a sectional view of a semiconductor package according to anembodiment of the inventive concept, which is taken along the line V-V′of FIG. 7B. FIG. 7B is a plan view illustrating a portion of asemiconductor package according to an embodiment of the inventiveconcept.

Referring to FIG. 7A, a semiconductor package 200 may be a multi-chippackage in which a first semiconductor chip 250 and a secondsemiconductor chip 255 are stacked on a package substrate 210 and theresulting structure is molded by a molding layer 280. The firstsemiconductor chip 250 may be faceup-mounted or facedown-mounted on thepackage substrate 210. The second semiconductor chip 255 may befaceup-mounted or facedown-mounted on the first semiconductor chip 250.

The package substrate 210 may be a PCB in which an upper dielectriclayer 214 and a lower dielectric layer 216 are formed respectively onthe top and bottom surfaces of a core 212 including a signal pattern 222and a power pattern 224. A substrate pad 218 for connecting an externalterminal 205 may be formed on the bottom surface of the core 212. Thefirst semiconductor chip 250 may be electrically connected to thepackage substrate 210 by through electrodes (or through vias) 272 and274. The through electrodes 272 and 274 may be formed by forming throughholes in the first semiconductor chip 250 by, for example, a laserdrilling process, and filling the through holes with silicon or metal.

The through electrodes 272 and 274 may include a plurality of firstthrough electrodes 272 connected to the signal patterns 222 to transmitdata signals between the first semiconductor chip 250 and the signalpatterns 222, and a plurality of second through electrodes 274 connectedto the power pattern 224 to deliver power from the power pattern 224 tothe first semiconductor chip 250. The signal pattern 222 may be inone-to-one correspondence with the first through electrode 272.Therefore, one first through electrode 272 may be connected to onesignal pattern 222. The power pattern 224 may be in one-to-one orone-to-many correspondence with the second through electrode 274. Thus,one or more second through electrodes 274 may be connected to one powerpattern 222.

Bumps 230 and 240 may be formed between the first semiconductor chip 250and the package substrate 210. The bumps 230 may include a plurality ofbumps 230 electrically connecting the signal patterns 222 to the firstthrough electrodes 272, and a plurality of bumps 240 electricallyconnecting the power pattern 224 to the second through electrodes 274.The bumps 230 and 240 may be formed by, for example, plating ordepositing metal (e.g., copper).

The electrical connection between the first semiconductor chip 250 andthe second semiconductor chip 255 may be implemented by redistributionpads 273 and 275 and interconnection bumps 292 and 294. For example,first redistribution pads 273 connected to the first through electrodes272 and second redistribution pads 275 connected to the second throughelectrodes 274 may be formed on the top surface of the firstsemiconductor chip 250. First interconnection bumps 292 connected to thefirst redistribution pads 273 and second interconnection bumps 294connected to the second redistribution pads 275 may be formed on thebottom surface of the second semiconductor chip 255. The configurationof the first redistribution pads 273 may depend on the configuration ofthe first interconnection bumps 292. For example, the firstredistribution pads 273 may be formed according to the arrangement ofthe first interconnection bumps 292. The configuration of the secondredistribution pads 275 may depend on the configuration of the secondinterconnection bumps 294.

Referring to FIGS. 7B and 7A, one signal pattern 222 may be connected toone first through electrode 272, the one first through electrode 272 maybe connected to one first redistribution pad 273, and the one firstredistribution pad 273 may be connected to one first interconnectionbump 292. The one first interconnection bump 292 may be a real bump.Accordingly, data signals may be exchanged between the signal pattern222 and the semiconductor chips 250 and 255.

A first redistribution pad 273 a for connecting a plurality of firstinterconnection bumps 292 and 292 a may be included. One firstredistribution pad 273 a may be used as a land for the firstinterconnection bumps 292 and 292 a. For example, the firstredistribution pad 273 a may be formed on at least one of the left andright edges 250 x and 250 z of the first semiconductor chip 250. One ofthe first interconnection bumps 292 and 292 a may be a real bump, andthe other may be a dummy bump or real bump. For example, among at leasttwo first interconnection bumps 292 and 292 a connected to the firstredistribution pad 273 a on the line V-V′, the first interconnectionbump 292 more adjacent to the center 255 y of the second semiconductorchip 255 may be a real bump, and the first interconnection bump 292 amore adjacent to the left edge 255 x of the second semiconductor chip255 may be a dummy bump or real bump. When the first interconnectionbump 292 a is a dummy bump, it may be used as a supporting bump forsupporting the left edge 255 x of the second semiconductor chip 255.When the first interconnection bump 292 a is a real bump, it may beelectrically connected to another first connection bump 292.

As an example, at least two first interconnection bumps 292 and 292 amay be connected to the first redistribution pad 273 a, and at least twofirst interconnection bumps 292 may be connected to another firstredistribution pad 273. One of at least two interconnection bumps 292may be a real bump, and the other may be a dummy bump or real bump.

One power pattern 224 may be connected to a plurality of second throughelectrodes 274. The plurality of second through electrodes 274 may beconnected to one second redistribution pad 275. The one secondredistribution pad 275 may be connected to a plurality of secondinterconnection bumps 294. The one second redistribution pad 275 is usedas a land for the plurality of second interconnection bumps 294. Atleast one of the second interconnection bumps 294 may be a real bump,and the others may be dummy bumps or real bumps. As an example, a secondinterconnection bump 294 a most adjacent to the left or right edge 250 xor 250 z of the first semiconductor chip 250 may be formed on the secondredistribution pad 275. For example, a second interconnection bump 294 amost adjacent to the right edge 250 z of the second semiconductor chip255 may be formed on the second redistribution pad 275 disposed on theline V-V′. When the second interconnection bump 294 a is a dummy bump,it may be used as a supporting bump for supporting the right edge 255 zof the second semiconductor chip 255. When the second interconnectionbump 294 a is a real bump, it may be electrically connected to otherreal bumps 294.

FIG. 8A is a sectional view of a semiconductor package according to anembodiment of the inventive concept, which is taken along the lineVI-VI′ of FIG. 8B. FIG. 8B is a plan view illustrating a portion of asemiconductor package according to an embodiment of the inventiveconcept.

Referring to FIG. 8A, a semiconductor package 300 may be apackage-on-package (POP) in which an upper package 304 is stacked on alower package 302. The lower package 302 may be a multi-chip package inwhich a plurality of lower semiconductor chips 350 are mounted on top ofeach other on a lower package substrate 310. Similarly, the upperpackage 304 may be a multi-chip package in which a plurality of uppersemiconductor chips 355 are mounted on top of each other on an upperpackage substrate 315. The lower package 302 and the upper package 304may be electrically connected to each other through at least oneredistribution pad 370 and at least one mold via group 390.

The lower package 302 may include a lower package substrate 310 such as,for example, a PCB provided with a lower circuit pattern 312 and aplurality of lower substrate pads 313 electrically connected to thelower circuit pattern 312, lower semiconductor chips 320 mounted on thelower package substrate 310, and a lower molding layer 380 molding thelower semiconductor chips 320. The lower circuit pattern may include asignal pattern, a power pattern and a ground pattern. The lowersemiconductor chip 320 may include a memory, a non-memory, or acombination thereof. The lower circuit patterns 312 may be electricallyconnected to the lower substrate pads 313. The lower semiconductor chips320 and the lower package substrate 310 may be adhered to each other bya dielectric adhesive 320, and may be electrically connected to eachother by a plurality of lower bonding wirers 340. The lower bondingwires 340 electrically connect the circuit pattern 312 to the lowersemiconductor chips 320. The lower bonding wires 340 may transmit data,power and ground signals between the lower semiconductor chips 320 andthe lower package substrate 310. As an example, the lower semiconductorchips 320 and the lower package substrate 310 may be electricallyconnected to each other by through electrodes (e.g., 272 and 274 of FIG.7A) penetrating the lower semiconductor chips 350. The lower package 302may include a plurality of external terminals 330 (e.g., solder ballsand solder bumps) that are connected to the lower substrate pads 313 toconnect the semiconductor package 300 to an external electrical device.

The upper package 304 may be configured in the same manner as the lowerpackage 302 in an embodiment. For example, the upper package 304 mayinclude a upper package substrate 315 such as a PCB including an uppercircuit pattern 317 and upper substrate pads 318 connected electricallyto the upper circuit pattern 317, upper semiconductor chips 355 mountedon the upper package substrate 315, a dielectric adhesive 325 foradhering the upper semiconductor chips 355 to the upper packagesubstrate 315, and an upper molding layer 304 for molding the uppersemiconductor chips 355. For example, the upper semiconductor chips 355and the upper package substrate 315 are electrically connected to eachother by an upper bonding wire 345 to exchange electrical signalsbetween the upper semiconductor chips 355 and the upper packagesubstrate 315. As an example, the bonding wires 345 may be replaced bythrough electrodes formed to penetrate the upper semiconductor chips355.

Referring to FIGS. 8B and 8A, the redistribution pad 370 may be formedon the uppermost lower semiconductor chip 350 t among the lowersemiconductor chips 350. The mold via group 390 may be connected to theredistribution pad 370. The mold via group 390 may include a pluralityof mold vias 391, 392 and 393. The mold vias 391 to 393 may be connectedto the upper substrate pads 318. The mold vias 391 to 393 may be formedby, for example, patterning the lower molding layer 380 to form mold viaholes 385 opening the redistribution pad 370 and filling the mold viaholes 385 with conductive materials such as metals or solders. Forexample, the mold vias 391 to 393 may be formed by bonding solder ballsto the upper substrate pads 318, coupling the lower package 302 and theupper package 304 to insert the solder balls into the mold via holes385, and performing a reflow process. The redistribution pad 370 may beelectrically connected to the lower circuit pattern 312 of the lowerpackage substrate 310 by the lower bonding wire 340. Thus, the lowerpackage 302 and the upper package 304 may be electrically connected toeach other by the mold via group 390 and the redistribution pad 370.

According to an embodiment, a plurality of mold vias 391 to 393 may beconnected in common to one redistribution pad 370. At least one of themold vias 391 to 393 connected to the redistribution pad 370 (e.g., themold via 391 formed at the center 300 y of the semiconductor package300) may be a real via provided as an electrical signal path between theupper and lower packages 302 and 304, and the other vias 392 and 393 maybe dummy vias. The dummy vias 392 and 393 may be used as supporting viasfor supporting the edges of the upper package 304. In this case, theupper substrate pads 318 connected to the dummy vias 392 and 393 may notbe formed in the upper package substrate 315. As an example, all of themold vias 391 to 393 connected to one redistribution pad 370 may be realvias. In this case, all the mold vias 391 to 393 may be connected to thelower substrate pads 318, and these lower substrate pads 318 may beelectrically connected to each other. At least one of the lower package302 and the upper package 304 may be replaced by one of all thesemiconductor packages according to the inventive concept. For example,the semiconductor packages 200 of FIG. 7A are vertically stacked and areelectrically connected to each other by redistribution pads and moldvias to form a package-on-package.

FIG. 9A is a sectional view of a semiconductor package according to anembodiment of the inventive concept. FIG. 9B is a perspective view of asemiconductor package according to an embodiment of the inventiveconcept.

Referring to FIGS. 9A and 9B, a semiconductor package 400 according toan embodiment may be a semiconductor module in which at least twopackages 450 are mounted on the top surface of a module substrate 410and a plurality of external terminals 405 formed on the bottom surfaceof the module substrate 410. The module substrate 410 may include a core412 including circuit patterns 422 and 424, an upper dielectric layer412 formed on the top surface of the core 412, and a lower dielectriclayer 414 formed on the bottom surface of the core 412. Thesemiconductor package 400 may include a plurality of substrate pads 418electrically connected to the plurality of external terminals 405 on thebottom surface of the module substrate 410. The semiconductor package400 may be electrically connected to an electrical device through theconnection terminals 405.

The package 450 may be electrically to the module substrate 410 byinterconnections terminals 430 and 440. The package 450 may be one ofthe various semiconductor packages according to the inventive concept.The interconnection terminals 430 and 440 may be connected to thecircuit patterns 422 and 424. The circuit patterns 422 and 424 mayinclude a signal pattern 422 and a power pattern 424. Theinterconnection terminals 430 and 440 may include a firstinterconnection terminal group 430 including a plurality of terminalsconnected to the signal pattern 422, and a second interconnectionterminal group 440 including a plurality of terminals connected to thepower pattern 424. One first interconnection terminal group 430 may beconnected to one signal pattern 422, and all of the terminals includedin the first interconnection terminal group 430 may be real terminalsconnected electrically to each other. One second interconnectionterminal group 440 may be connected to one power pattern 424, and all ofthe terminals included in the second interconnection terminal group 440may be real terminals connected electrically to each other.

FIG. 9C is a sectional view illustrating an embodiment of thesemiconductor package of FIG. 9A. FIG. 9D is a perspective viewillustrating an embodiment of the semiconductor package of FIG. 9A.

Referring to FIGS. 9B and 9C, a semiconductor package 402 according toan embodiment may include packages 450 formed on the top and bottomsurfaces of a module substrate 410. The semiconductor package 402 may beconnected to an electrical device by external pads 406 connectedelectrically to the circuit patterns 422 and 424. The external pads 406may be formed on one side of a package substrate 410.

The semiconductor packages 400 and 402 may be used in various devices.For example, the semiconductor packages 400 and 402 may be used invarious electronic devices such as, for example, mobile electronicdevices, notebook computers, portable multimedia players (PMPs), MP3players, camcorders, memory sticks, memory cards, and solid state drives(SSDs).

FIG. 10A is a block diagram of a memory card having a semiconductorpackage according to an embodiment of the inventive concept.

Referring to FIG. 10A, a semiconductor memory 1210 includingsemiconductor packages according to various embodiments of the inventiveconcept may be applicable to a memory card 1200. For example, the memorycard 1200 includes a memory controller 1220 that controls data exchangebetween a host and the memory 1210. An SRAM 1221 may be used as aworking memory of a central processing unit (CPU) 1222. A host interface(I/F) 1223 may have a data exchange protocol of the host connected tothe memory card 1200. An error correction code (ECC) 1224 detects andcorrects an error in data read from the memory 1210. A memory interface(I/F) 1225 interfaces with the memory 1210. The CPU 1222 performs anoverall control operation for data exchange of the memory controller1220.

FIG. 10B is a block diagram of an information processing system using asemiconductor package according to an embodiment of the inventiveconcept.

Referring to FIG. 10B, an information processing system 1300 may includea memory system 1310 having a semiconductor package according to anembodiment of the inventive concept. Examples of the informationprocessing system 1300 include mobile devices and computers. Forexample, the information processing system 1300 includes a memory system1310, a modem 1320, a central processing unit (CPU) 1330, a RAM 1340,and a user interface 1350 that are electrically connected to a systembus 1360. The memory system 1310 may include a memory 1311 and a memorycontroller 1312 and may have substantially the same configuration as thememory card 1200 of FIG. 10A. Data processed by the CPU 1330 or datareceived from an external device may be stored in the memory system1310. The information processing system 1300 may be provided for memorycards, solid state disks, camera image sensors, and other applicationchipsets. For example, the memory system 1310 may be configured using asolid state disk (SSD). In this case, the information processing system1300 can store a large amount of data in the memory system 1310 stablyand reliably.

Also, the semiconductor packages according to embodiments of theinventive concept may be mounted in various types of packages. Examplesof the packages for the semiconductor packages according to embodimentsof the inventive concept include Package on Package, Ball Grid Array,Chip Scale Package, Plastic Leaded Chip Carrier, Plastic Dual In-linePackage, Multi Chip Package, Wafer Level Package, Wafer Level StackPackage, Die On Waffle Package, Die in Wafer Form, Chip On Board,Ceramic Dual In-line Package, Plastic Metric Quad Flat Pack, Thin QuadFlat Pack, Small Outline Package, Shrink Small Outline Package, ThinSmall Outline Package, Thin Quad Flat Package, and System In Package.

According to embodiments of the inventive concept, bumps supporting orconnecting to semiconductor chips are bonded to PCB patterns such assignal, power and ground patterns of a PCB, thereby improving theelectrical and mechanical characteristics. Also, because the PCBpatterns can be used as a land, it is unnecessary to form a separateland. Also, because it is unnecessary to form the PCB patterns in abypass manner, the PCB can be effectively used. The inventive conceptcan be widely used for chip stacking, package stacking, semiconductormodules, or mounting semiconductor chips on a PCB.

Although the exemplary embodiments of the inventive concept have beendescribed herein with reference to the accompanying drawings, it is tobe understood that the present invention should not be limited to thoseprecise embodiments and that various other changes and modifications maybe affected therein by one of ordinary skill in the related art withoutdeparting from the scope or spirit of the invention. All such changesand modifications are intended to be included within the scope of theinvention as defined by the appended claims.

What is claimed is:
 1. A semiconductor package, comprising: a substratehaving a plurality of first patterns disposed in a first direction, eachof the plurality of first patterns including a first land and a firstextension extending along a second direction that is substantiallyperpendicular to the first direction, wherein a first real bump isdisposed on the first land and a plurality of first dummy bumps aredisposed on the first extension; and a plurality of second patternsdisposed in the first direction, each of the plurality of secondpatterns including a second land and a second extension, wherein asecond real bump is disposed on the second land and a plurality ofsecond dummy bumps are disposed on the second extension in the seconddirection, wherein the plurality of first patterns is a mirror image ofthe plurality of second patterns with respect to an imaginary centerline extending in the first direction through the center of thesubstrate.
 2. The package of claim 1, wherein the first and second realand dummy bumps are configured to support a semiconductor chip, and thefirst and second real bumps are electrically conductive.
 3. The packageof claim 1, wherein there are at least three dummy bumps disposed oneach first pattern or each second pattern.
 4. The package of claim 1,wherein there are at least six first patterns and at least six secondpatterns.
 5. A semiconductor package, comprising: a package substratehaving a plurality of patterns, each comprising a land and an extensionextending from the land in a first direction, wherein the land isconfigured to receive a conductive bump and the extension is configuredto receive a plurality of dummy bumps spaced at an equal distance fromeach other, and wherein the plurality of patterns are positioned with afirst set of patterns in a second direction perpendicular to the firstdirection, and a second set of patterns in the second direction, thefirst set of patterns and the second set of patterns opposing each otherwith respect to an imaginary line extending in the second directionalong the center of the package substrate.
 6. The semiconductor packageof claim 5, wherein a width of the land is different from a width of theextension.
 7. The semiconductor package of claim 5, wherein theconductive bump is connected to an on-chip circuit via a pad, and thedummy bumps are disposed on an insulation layer.
 8. The semiconductorpackage of claim 5, wherein there are at least three dummy bumpsdisposed on each pattern.
 9. The semiconductor package of claim 5,wherein there are at least three patterns in the first set or the secondset of patterns.
 10. The semiconductor package of claim 5, wherein thereare at least six patterns in the first set or the second set ofpatterns.
 11. A semiconductor package, comprising: a package substrate;a semiconductor chip disposed on the package substrate, thesemiconductor chip having a first bump group including a first real bumpand a plurality of first dummy bumps and a second bump group including asecond real bump and a plurality of second dummy bumps; a first patterndisposed on the package substrate and connected to the first bump group,the first pattern including a first land and a first extension, whereinthe first real bump is disposed on the first land, and the plurality offirst dummy bumps is disposed on the first extension; and a secondpattern disposed on the substrate and connected to the second bumpgroup, the second pattern including a second land and a secondextension, wherein the second real bump is disposed on the second land,and the plurality of second dummy bumps is disposed on the secondextension, and wherein the first pattern and the second pattern arespaced apart from each other and are disposed along a first line, andwherein the first pattern and the second pattern are substantiallysymmetrical with each other with respect to a center line between thefirst pattern and the second pattern, the center line substantiallyperpendicular with the first line.
 12. The semiconductor package ofclaim 11, wherein the plurality of first dummy bumps and the pluralityof second dummy bumps are positioned between the first real bump and thesecond real bump.
 13. The semiconductor package of claim 11, wherein adata signal is transmitted through the first pattern to thesemiconductor chip, and power is supplied to the semiconductor chipthrough the.second pattern.
 14. The semiconductor package of claim 11,wherein the first extension extends from the first land along the firstline, and the second extension extends from the second land along thefirst line.
 15. The semiconductor package of claim 11, wherein a widthof the first land is larger than a width of the first extension.
 16. Thesemiconductor package of claim 11, wherein a width of the second land islarger than a width of the second extension.
 17. The semiconductorpackage of claim 11, wherein the first real bump provides an electricalsignal path between the semiconductor chip and the first pattern, andthe second real bump provides an electrical signal path between thesemiconductor chip and the second pattern.
 18. The semiconductor packageof claim 11, wherein the plurality of first dummy bumps and theplurality of second dummy bumps support the semiconductor chip on thesubstrate.